有a.maths 唔識做
回答 (3)
2008-06-08 7:38 am
✔ 最佳答案
tan5x = cot5x tan5x=tan(90*-5x)
5x=180n*+(90*-5x)
10x=180n*+90*
x=18n*+9*
2008-06-07 23:39:40 補充：
@﹏@估5到慢過上面個位tim..慢左=﹏=
2008-06-07 23:40:39 補充：
有改地方:
x=18n*+9* ,where n is any integer
參考: me
2008-06-08 4:11 am
tan5x = cot5x
tan5x=tan(90˚-5x)
5x=180n˚+(90˚-5x),where n is an integer
10x=180n˚+90˚
x=18n˚+9˚
tan5x=tan(90˚-5x)
5x=180n˚+(90˚-5x),where n is an integer
10x=180n˚+90˚
x=18n˚+9˚
2008-06-08 4:11 am
tan5x = cot5x
tan²5x=1
5x=180°n+45°
x=36°n+9°, where n is any integer
tan²5x=1
5x=180°n+45°
x=36°n+9°, where n is any integer
收錄日期: 2021-04-23 20:34:49
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